A theoretical model is presented relating the gas dynamics and chemical kinetics of the opposed flow diffusion flame formed in the stagnation region between two opposing streams of gaseous reactants, one originating from the surface of a subliming solid, such as ammonium perchlorate. At low gas flows the regression rate of the solid is controlled by the physical properties of the system, including the net heat of gasification, the heat of combustion, and the transport parameters. At high gas flows a limiting solid regression rate is attained due to reaction-rate limitations that cause incomplete combustion of the reactants. The theoretical model developed for the heterogeneous opposed flow diffusion flame allows interpretation of the limit in solid regression rates in terms of global reaction kinetics.

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